Broadcast Txn failed

The account received rewards (like all accounts).

Need a little ALGO for testing my wallet

Yes, you can use the same address for both mainnet and testnet. The testnet dispenser can be found on this link https://developer.algorand.org/docs/reference/algorand-networks/testnet/#faucet.

Node synchronization time

I’m currently synchronising a node that has a 10 year old AMD Athlon 64 X2 QL-54 processor and it’s being throttled by the CPU and not the network connectivity. Whilst both cores are running close to 100% utilization, it is averaging less than 0.3 MiB/s of a 60Mbps internet connection.